Honeywell W6215, W7215, W7460 Data Sheet

Economizer Logic Modules

APPLICATION

W6215, W7215, and W7460 Economizer Logic Modules are used with an indoor sensor input (ISI), and solid state C7400 Enthalpy Sensors or C7650 Dry Bulb Temperature Sensors. All models proportion outdoor and return air dampers for control of free cooling in commercial HVAC equipment. The W7215B and W7460B are used with an outdoor sensor input (OSI) along with the ISI.

W6215, W7215, W7460

FOR VENTILATION CONTROL

PRODUCT DATA

FEATURES

• Operates from the space thermostat and an ISI to provide a totally integrated control system.

• Solid state control package provides accuracy, reliability and stability.

• Housed in high-impact, glass-fiber reinforced plastic case.

• Mounts on sheet metal duct or remotely in a mechanical room. Mounting screws included.

• The W6215 and W7215 are used with Honeywell Series 62 and Series 72 actuators (respectively). The W7460 is used with Honeywell M7415 Damper Actuators.

• Combines minimum and maximum damper position potentiometers and compressor staging relay functions with solid state enthalpy or dry bulb changeover control this control can be tempered by ISI, and fan cycling.

• Outdoor Sensor input incorporated into logic of W7215B and W7460B models.

• Shutdown and Air Change can be used with all models.

• Purge cycling can be used with the W6215A, W7215A and W7460A models.

• Terminals included for connecting optional S963B1128 Remote Potentiometers for remote minimum and maximum damper position control.

• LED and relay terminals indicate when free cooling is available.

• LED indicates when module is in ISI mode.

Contents

Application ........................................................................ 1

Features ........................................................................... 1

Specifications ................................................................... 2

Ordering Information ........................................................ 2

Installation ........................................................................ 3

Operation .......................................................................... 5

Settings and Adjustments ................................................. 6

Checkout and Troubleshooting ......................................... 26

63- 2544- 3

W6215, W7215, W7460 ECONOMIZER LOGIC MODULES

SPECIFICATIONS

Models:

See Table 1.

Dimensions: See Fig. 1.

Electrical Ratings:

Input Voltage: 24 Vac +20%, -15%; 50/60 Hz (Class 2). Nominal Power Consumption (at 24 Vac, 60 Hz):

W6215A: 12.5 VA. W7215A, W7460A: 10 VA. W7215B, W7460B: 10.5 VA.

Relay Contact Rating at 30 Vac (maximum power from class 2

input only): 1.5A run, 3.5A inrush.

Ambient Ratings:

Temperature:

Operating Ambient: -25°F to +125°F (-32°C to +52°C). Shipping: -25°F to +125°F (-32°C to +52°C).

Humidity (Noncondensing): 5 to 95 percent rh.

Inputs:

Enthalpy (C7400): 2-wire (18,20,22 AWG) connection. Dry Bulb Temperature (C7650): 2-wire (18,20,22 AWG)

connection. Discharge Air (C7046): 2-wire (18,20,22 AWG) connection. Mixed Air (C7150): 2-wire (18,20,22 AWG) connection. Indoor Sensor: 2-10 Vdc control signal. Outdoor Sensor (W7215B and W7460B only): 2-10 Vdc

control signal.

Outputs:

W7215: 2-10 Vdc. W6215: Series 62 (Open/Close/Hold). 24 Vac out (W7215, W6215 only): 25 VA maximum.

Accessories:

32004783-001 Weather Shield Economizers. 4074EJM Bag Assembly. Consists of: Checkout jumper,

620 ohm, 1.2K ohm, 5.6K ohm, and 6.8K ohm checkout

resistors, and 536 ohm, 665 ohm, and 3480 ohm resistors

for use with Honeywell Series 90 Actuators. C7046A Discharge Air Temperature Sensor. C7150B Mixed Air Temperature Sensor. C7400 Solid State Enthalpy Sensor. C7650 Dry Bulb Temperature Sensor. S963B1128 Remote Potentiometer to provide remote control

of damper minimum or maximum position. ST6008 Energy Management Timer for occupied/unoccupied

control.

Approvals:

Underwriters Laboratories Inc. listed: Meets UL873

plenum requirements.

3/4 (19)

(25)

24VAC

TR Hot

Maximum

Position

Open

Free Cool

Mininum Position

Closed

ISI

Set Pt

ISI

50%

Exhaust

Set Pt

Exhaust

100%

TR1 Com

AQ1

SD1

AC1

PC1

8-5/8

(219)

–

(25)

1-9/16

(40)

–

24VAC

Hot

24VAC

Com

2-10V

OUT

Free Cool

Unit

Control Exhaust

Fan

Indoor

Fan

W7215A

5-3/4 (146)

Fig. 1. W6215,W7215,W7460 dimensions

in in. (mm). [W7215A shown]

M11788A

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number.

If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:

1. Your local Home and Building Control Sales Office (check white pages of your phone directory).

2. Home and Building Control Customer Relations

Honeywell, 1885 Douglas Drive North

Minneapolis, Minnesota 55422-4386 In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.

63-2544—3 2

W6215, W7215, W7460 ECONOMIZER LOGIC MODULES

Table 1. W6215, W7215, and W7460 Economizer Models.

For Use

Model

W6215A Honeywell Series 62 C7150B or C7046A Sensor No Adjustable Yes

W7215A Honeywell Series 72 C7150B or C7046A Sensor No Adjustable Yes

W7215B Honeywell Series 72 C7150B or C7046A Sensor Yes Fixed No

W7460A Honeywell M7415 C7150B or C7046A Sensor No Adjustable Yes

W7460B Honeywell M7415 C7150B or C7046A Sensor Yes Fixed No

NOTE: All models include minimum and maximum position potentiometers, setpoint for enthalpy or dry-bulb, and ISI setpoint.

with Actuator

Discharge Air

Temperature Input

Outdoor Sensor

Input (OSI) Setpoint

Exhaust

Fan Setpoint Purge

INSTALLATION

When Installing this Product...

Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.

Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.

3. Installer must be a trained, experienced service technician.

4. After installation is complete, check out product operation as provided in these instructions.

CAUTION

Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry.

Disconnect power supply before installation.

IMPORTANT

Location and Mounting

All wiring must agree with applicable codes, ordinances and regulations.

OUTDOOR AIR SENSING

Mount sensor in any orientation that exposes it to freely circulating air and protects it from rain, snow, and direct sunlight.

2. Connect it to the S

RETURN AIR SENSING

Ensure differential enthalpy control has a second sensor in the return air duct.

2. Connect this sensor to the S W6215, W7215, or W7460.

and + terminals of the device.

and + terminals of the

W6210 A 1003

W6215, W7215, W7460 Economizer Logic Module

W6215, W7215, and W7460 Logic Modules mount directly on a sheet metal duct or panel. When planning the installation, allow enough clearance for maintenance and service. Mount device in a location protected from rain, snow, and direct sunlight. Secure device to sheet metal using the three supplied mounting screws, see Fig. 2.

NOTE: See Fig. 3 for representative locations of connected

system devices.

C7400 Enthalpy Sensor and C7650 Dry Bulb Temperature Sensor

W6215,W7215,W7460 Logic Modules accept signals from either the C7400 Enthalpy Sensor or the C7650 Dry Bulb Temperature Sensor. The wiring is the same for either sensor.

IMPORTANT

When using differential sensing, both sensors must be of the same type (enthalpy or dry bulb).

M1179

Fig. 2. Mounting W6215, W7215, W7460 on sheet metal.

Indoor Sensor Input

The ISI can be any sensor that provides a 2-10 Vdc output. The ISI modulates the outdoor damper to provide ventilation based on occupancy. The designer determines contaminants to monitor, selects appropriate sensor, determines the sensor threshold, and adjusts the ISI potentiometer accordingly. The ISI LED lights when the ISI signal is above setpoint. Mount the sensor according to the manufacturer specifications. If not available, use the following guidelines:

1. Mount sensor in an area with unobstructed air circulation.

2. Connect it to the AQ

W7215, or W7460 (see Wiring section for details).

3. Adjust the ISI potentiometer setpoint to correspond to ISI voltage output at the threshold.

IMPORTANT

Ensure proper polarity of sensor connections. Incorrect polarity negates the sensor signal.

3 63-2544—3

and AQ1 terminals of the W6215,

W6215, W7215, W7460 ECONOMIZER LOGIC MODULES

Outdoor Sensor Input (W7215B and W7460B only)

The OSI sensor can be any sensor that provides a 2-10 Vdc output. Mount the sensor according to the manufacturer specifications. If not available, use the following guidelines:

1. Mount sensor in an area with unobstructed air circulation that is protected from rain, snow, and direct sunlight.

DISCHARGE AIR SENSOR

INDOOR FAN

DIRECT EXPANSION COIL

W6215, W7215, OR W7460

C7046A

DISCHARGE AIR

C7150B

MIXED AIR SENSOR

C7400

ENTHALPY SENSOR

IMPORTANT

Ensure proper polarity of sensor connections. Incorrect polarity negates the sensor signal.

2. Connect it to the OA or W7460B (see Wiring section for details).

and OA1 terminals of the W7215B,

3. Adjust the OSI potentiometer setpoint to correspond to OSI sensor voltage output at the threshold.

SPACE

SERIES 62 OR 72 ACTUATOR

THERMOSTAT

C7400

OUTDOOR AIR SENSOR

INDOOR AIR SENSOR

ENTHALPY SENSOR

OUTDOOR AIR

FOR DIFFERENTIAL ENTHALPY, THE TWO C7400

ENTHALPY SENSORS ARE CONNECTED TO THE W6215/W7215/W7460 ECONOMIZER CONTROL—ONE IS MOUNTED IN RETURN AIR, AND THE OTHER IS MOUNTED IN OUTDOOR AIR. DIFFERENTIAL ENTHALPY CONTROL PROVIDES GREATER ENERGY SAVINGS THAN SINGLE ENTHALPY.

USE EITHER MIXED AIR SENSOR OR DISCHARGE AIR SENSOR, NOT BOTH.

Fig. 3. Representative locations of connected Economizer system devices.

Wiring

CAUTION

Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry.

Disconnect power supply before installation.

IMPORTANT

1. All wiring must comply with applicable local codes, ordinances and regulations.

2. Refer to Fig. 6 through 25 for typical wiring diagrams.

3. Refer to Table 2 for a list of the wiring diagrams and corresponding Figure numbers in this document.

4. All device inputs and outputs must be 24 Vac Class 2.

NOTE: All connections with label designation ending in 1

(examples: TR1, T1, P1, Q1, AQ1) are ac/dc common connections.

EXHAUST FAN

RETURN AIR

EXHAUST AIR

M11816

Optional Applications

Remote Minimum Position Control

Remote control of outdoor air dampers is desirable when requiring temporary additional ventilation. One potentiometer controls the damper minimum position, another potentiometer controls the damper maximum position. The addition of S963B1128 Remote Potentiometers allows occupants to open or close the dampers beyond minimum position for modified ventilation. Connect the potentiometers as shown in Fig. 4.

IMPORTANT

Free Cool Timing

The Free Cool contacts close while the logic module operates free cooling. Connecting a timer to these contacts allows tracking of the free cooling usage time.

The minimum position signal takes priority to the maximum position signal. With the maximum set below the minimum, the logic module signals the actuator to maintain the minimum position.

63-2544—3 4

W6215, W7215, W7460 ECONOMIZER LOGIC MODULES

Table 2. Applicable Wiring Diagrams.

Logic Module Actuator Enthalpy Changeover Figure Comments

W6215A Honeywell Series 62 Single 8 Single-stage cooling system.

Single or Differential 9 Two-stage cooling system.

W7215A Honeywell Series 72 Single 10 Single-stage cooling system.

Single or Differential 11 Two-stage cooling system.

12 T775 controller.

Honeywell Series 90 n/a 6 Add Q7230 Interface Module.

W7215B Honeywell Series 72 Single 13 Single-stage cooling system.

Single or Differential 14 Two-stage cooling system.

15 T775 controller.

W7460A Honeywell M7415 Single 16 Single-stage cooling system.

Single or Differential 17 Two-stage cooling system.

W7460B Honeywell M7415 Single 18 Single-stage cooling system.

Single or Differential 19 Two-stage cooling system.

ALL n/a n/a 20 W7100 controller.

25 W973 Logic Panel.

4 S963 remote damper control.

Parallel Wiring

W6215 Honeywell Series 62 Single or Differential 21 Honeywell Series 62 Direct Coupled Actuators.

W7215A Honeywell Series 72 22 Honeywell Series 72 Direct Coupled Actuators.

23 Honeywell Series 72 Modutrol Motors.

Honeywell M7415 24 M7415 Motors.

OPERATION

The purpose of the economizer is to use outdoor air for cooling, whenever possible, to reduce compressor operation.

When wired as shown in Fig. 6 through 25, the logic module responds to the cooling thermostat signal. This system uses C7400 Solid State Enthalpy Changeover Sensor(s) or C7650 Dry Bulb Temperature Sensor(s). The C7400 responds to both dry bulb temperature and humidity, allowing use of outdoor air at higher temperatures for free cooling when humidity is low. The C7650 responds only to dry bulb temperature; use only in dry, arid climates.

The logic module functions as a true first stage of cooling providing maximum fuel economy during the cooling cycle. It automatically locks out free cooling during heating; holding the outdoor air damper at the minimum position setting.

The logic module can operate as either a basic free cooling controller, or it can incorporate additional functions. Tables 3 and 5 detail the input/output (I/O) logic of the module. Certain functions—Purge, Shutdown, and Air Change—override others, see Table 3. When these functions are all off, the logic module energizes the Unit Control and Indoor Fan contacts, operating according to Table 5.

Purge (W6215A, W7215A, and W7460A only)

When terminals PG and PG1 connect through relay contacts or a jumper:

1. Outdoor damper drives fully closed.

Exhaust fan turns on.

S963B1128 REMOTE

OPEN

MINIMUM POSITION ADJUSTMENT

MAXIMUM POSITION ADJUSTMENT

W6215/W7215/W7460 ECONOMIZER

Fig. 4. S963B1128 Remote Potentiometer used with

W6215, W7215, W7460 for remote damper control.

POTENTIOMETER

CCW OPEN

135 OHM

S963B1128 REMOTE POTENTIOMETER

CCW OPEN

135 OHM

CW CLOSE

M11796A

5 63-2544—3

W6215, W7215, W7460 ECONOMIZER LOGIC MODULES

Table 3. W6215, W7215, W7460 Economizer Purge,

Shutdown, and Air Change I/O Logic.

INPUTS OUTPUTS

Purge

Shut-

down

Air

Change Damper

Unit

Control

Indoor

Fan Exhaust

On - - Fully Closed Off Off On

Off On - Off

Off On Fully Open On On

Purge present only on W6215A, W7215A, and W7460A.

Shutdown

One contact closure shuts down all systems. When terminals SD and SD1 connect through relay contacts or a jumper:

Outdoor damper drives fully closed.

Exhaust fan turns off.

3. Indoor fan turns off.

Air Change

When terminals AC and AC1 connect through relay contacts or a jumper:

1. Outdoor damper drives fully open.

2. Exhaust fan turns on.

3. Indoor fan turns on.

NOTE: With Purge, Shutdown, and Air Change de-

energized, Exhaust will be de-energized unless the signal exceeds the exhaust fan setpoint; other logic module functions remain unaltered.

SETTINGS AND ADJUSTMENTS

Potentiometers with screwdriver adjustment slots, located on the device face, provide adjustments for several parameters (see Fig. 5 for locations on device): — ISI setpoint. — OSI setpoint (W7215B and W7460B only).

— Minimum damper position. — Maximum damper position. — Enthalpy changeover. — Exhaust setpoint (W6215A, W7215A and W7460A only).

Indoor Sensor Input Setpoint

The logic module modulates the outdoor damper to provide ventilation based on the 2-10 Vdc ISI. With no cooling signal, the ISI overrides the outdoor air damper when ventilation requires outdoor air.

Outdoor Sensor Input Setpoint (W7215B and W7460B only)

The OSI logic operates from a 2-10 Vdc sensor signal. The operation of these logic modules is slightly different from the other models, see Table 4.

Table 4. W7215B and W7460B OSI Operation.

OSI ISI Actuator OSI LED Alarm

Below set Below set

Above set

Modulates

Above set Below set Fully closed On Off

Above set

Modulation based on signal from mixed air sensor.

With ISI signal greater than mixed air sensor signal:

Modulates

Modulation, based on ISI signal, between minimum and maximum positions.

With ISI signal less than mixed air sensor signal: Modulation, based on mixed air sensor signal, between: M7215B: Minimum and full open positions M7460B: Minimum and maximum positions.

Modulation based on mixed air sensor signal; connect to energize warning light, audio alarm, or air cleaner.

Off Off

On On

Alarm

terminals

Table 5. W6215, W7215, W7460 Economizer I/O Logic.

INPUTS OUTPUTS

Damper

Compressor

On Off On Off

Modulating

On Off

ISI

Below set (ISI LED Off)

Enthalpy

Outdoor Return 1 2

High (Free Cooling LED Off) Low On On Minimum position On On

Low (Free Cooling LED On) High On On

On Off Off Off

Above set (ISI LED On)

High (Free Cooling LED Off) Low On On

On Off On Off

Low (Free Cooling LED On) High On On

Modulating

On On

On Off

On Off Off Off

For single enthalpy control, the module compares outdoor enthalpy to the ABCD setpoint.

If both stages of cooling are off, the system is off and the damper is at: • Minimum position if ISI is below setpoint.

W6215, W7460: Modulation, based on the mixed air sensor signal, between minimum and maximum positions. W7215: Modulation, based on the mixed air sensor signal, between minimum and full-open positions.

Modulation, based on the ISI, between minimum and maximum positions.

Modulation, based on the greater of ISI and mixed air sensor signals, between minimum and either maximum position (ISI) or

• Modulating if ISI is above setpoint.

fully open (mixed air signal).

NOTE: Each sensor has it’s own setpoint for threshold and LED indication.

63-2544—3 6

W6215, W7215, W7460 ECONOMIZER LOGIC MODULES

24VAC

Hot

24VAC

Com

2-10V

OUT

–

Free Cool

Unit

Control Exhaust

Fan

Indoor

Fan

LED LIGHTS WHEN EXHAUST IS ON

W7215A

TR Hot

Mininum Position

Open

Free Cool Maximum

Position

Closed

ISI

Set Pt

ISI

50%

0% Exhaust

Set Pt

Exhaust

TR1 Com

AQ1

–

SD1

AC1

PG1

100%

Fig. 5. Potentiometer and LED locations.

ENTHALPY CHANGEOVER SETPOINT

MINIMUM DAMPER POSITION SETTING

LED LIGHTS WHEN OUTDOOR AIR IS SUITABLE FOR FREE COOLING

MAXIMUM DAMPER POSITION SETTING

INDOOR AIR SENSOR SETPOINT

LED LIGHTS WHEN INDOOR SENSOR INPU IS ABOVE SETPOINT

EXHAUST FAN SETPOINT

M11787A

NOTE: Make minimum position adjustments with at least a

10°F [6°C] temperature difference between outdoor and return air.

1. Calculate the appropriate mixed air temperature, see Equation 1.

2. Disconnect mixed air sensor from terminals T and T1.

3. Ensure that either the factory-installed jumper is in

place across terminals P and P1 or, of remote damper position is required, that it is wired according to Fig. 4 and turned fully clockwise.

Connect 24 Vac across terminals TR and TR1.

5. Carefully adjust the potentiometer on the face of the device with a small screwdriver until the mixed air temperature reaches the calculated value.

NOTE: Ensure that the sensed air is well mixed.

Equation 1. Formula to aid in minimum position

adjustment.

TOOA×()TRRA×()+ TM=

Where: TO = Outdoor air temperature OA = Percent of outdoor air

= Return air temperature

RA = Percent of return air

= Resulting mixed air temperature

IMPORTANT

This procedure requires use of a quality thermometer capable of reading to 0.5°F [0.25°C].

Adjusting Minimum and Maximum Positions

The minimum position potentiometer maintains the minimum outdoor air flow into the building during occupied period. The maximum position potentiometer allows the installer to limit the amount of outdoor air flow into the building, when the ISI overrides the mixed air sensor. Setting the maximum position of the damper prevents the introduction of large amounts of hot or cold air into the space.

IMPORTANT

NOTES:

Minimum Position Adjustment

For detailed assistance in minimum position selection reference the Economizer Application Guide (form 63-8594) Ventilation section. The following provides basic guidelines for minimum position selection and adjustment:

IMPORTANT

With the maximum position set below the minimum position, the minimum position overrides the maximum position (negating most functions of the logic module, as the damper cannot move).

— When the mixed air sensor takes control, it

overrides the maximum position potentiometer.

— If mixed air temperature drops to 40°F, the mixed

air sensor overrides the ISI and closes the damper to minimum position to protect from freezing the hot or chilled water coils. Control returns to normal once the mixed air temperature rises to 43°F.

Adjust the minimum position potentiometer to allow the minimum amount of outdoor air, as required by local codes, to enter the building.

NOTE: The following sample calculation uses only

Fahrenheit temperature.

EXAMPLE: Assume local codes require 10% outdoor air

during occupied conditions, outdoor air is 60°F and return air is 75°F. Under these conditions, what is the temperature of the mixed air?

0.1 60°F×()0.9 75°F×()+ 6.0°F 67.5°F+ 73.5°F==

Mixed air will be 73.5°F when OA is 60°F and RA is 75°F with 10 percent outdoor air entering the building.

Maximum Position Adjustment

1. Disconnect mixed air sensor from terminals T and T1 and short terminals T and T1.

2. Make sure either the factory-installed jumper is in place across terminals Q and Q1 or, if remote damper position is required, that it is wired according to Fig. 4 and turned fully clockwise.

3. Connect 24 Vac across terminals TR and TR1.

4. Adjust the potentiometer on the face of the device with a

screwdriver for desired maximum position.

Enthalpy Changeover

Outdoor Enthalpy Changeover Setpoint

The outdoor enthalpy changeover setpoint returns the outdoor air damper to minimum position when enthalpy rises above its setpoint. Enthalpy setpoint scale markings, located in the device, are A, B, C, and D. See Fig. 7 for the corresponding control point. The factory-installed 620-ohm jumper must be in place across terminals S

and +.

7 63-2544—3

W6215, W7215, W7460 ECONOMIZER LOGIC MODULES

100

105

110

)

Differential Enthalpy Changeover Setting

Differential enthalpy control uses two C7400 Enthalpy Sensors connected to one logic module. The logic module compares outdoor air to return air instead of to a setpoint as it does for single enthalpy. Turn the setpoint potentiometer fully clockwise to the D setting. The logic module selects the lower enthalpy air (return or outdoor) for cooling; for example, when outdoor air has lower enthalpy than return air, the outdoor air damper opens to bring in outdoor air for free cooling.

Exhaust Setpoint

Except for Purge, Shutdown, and Air Change, the exhaust setpoint determines when the exhaust fan runs based on the damper position. When the ISI call for exhaust comes, the module provides a 45 ±15 second delay before exhaust fan activation. This delay allows the damper to reach the appropriate position to avoid unnecessary fan overload.

Adjustable Exhaust Setpoint (W6215A, W7215A, and W7460A only)

The W6215A, W7215A, and W7460A Logic Modules have an adjustable setpoint. This potentiometer allows the installer to set the exhaust setpoint at an actual damper position percentage open from fully closed.

Fixed Exhaust Setpoint (W7215B and W7460B)

The W7215B and W7460B Logic Modules have a fixed exhaust setpoint. The logic module uses an exhaust setpoint of 60 percent. When the damper reaches 60 percent open (from fully closed), the logic module calls for exhaust.

W7215A

HONEYWELL SERIES 90 ACTUATOR

(ML9175, ML9185, M9175, M9185)

M11903A

USE 1/2 WATT, 1% RESISTORS OF SPECIFIED OHM RATINGS (INCLUDED IN 4074EJM RESISTOR KIT). FOR MOD IV MOTORS, THE Q7230 MODULE CAN REPLACE THE RESISTORS.

665 Ohms

3480 Ohms

536 Ohms

Fig. 6. W7215A used with Honeywell Series 90 Actuator.

24 VAC HOT 24 VAC COM

2-10V OUT

–

TR1

CONTROL

12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

CURVE

B C D

CONTROL POINT

APPROX. °F (°C)

AT 50% RH

73 (23) 70 (21) 67 (19) 63 (17)

ENTHALPY—BTU PER POUND DRY AIR

(16)

(13)

(10)

(7) 40 (4)

35 (2)

(24)

(21)

100

(18)

(27)

(29)90(32)95(35)

RELATIVE HUMIDITY (%)

(38)

(41)

(43

(2)

(4)

(7)

(10)

(13)

APPROXIMATE DRY BULB TEMPERATURE—°F (°C)

Fig. 7. W6215, W7210, and W7460/C7400 performance characteristics for enthalpy changeover settings.

63-2544—3 8

(16)

(18)

(21)

105

(24)

(27)

(29)90(32)95(35)

100 (38)

(41)

(43

M11806

HONEYWELL

SERIES 62

ACTUATOR

(ML6275,

ML6285,

M6275,

M6285)

24 VAC HOT 24 VAC COM

OPEN

W6215A

W6215, W7215, W7460 ECONOMIZER LOGIC MODULES

TR1

C7400 OUTDOOR

620 OHM RESISTOR

AIR ENTHALPY

SENSOR

500 OHM

OPEN

WIPER

CLOSED

1S1

MINIMUM POSITION ADJUSTMENT

MAXIMUM

FREE

POSITION

COOL

ADJUSTMENT

UNIT CONTROL

EXHAUST FAN

INDOOR FAN

T6031 AMBIENT

LOCKOUT CONTROL

50 F SETPOINT

AQ1

SD1

AC1

PG1

C7150B MIXED AIR OR C7046A DISCHARGE AIR SENSOR

2-10 VDC INDOOR AIR SENSOR

SHUT DOWN

AIR CHANGE

PURGE

UNOCCUPIED

ST6008 TIMER

OCCUPIED

COOL 1

HEAT 2

HEAT 1

FAN DELAY RELAY

FAN

M11803A

L2 L1

(HOT)

T7300 OR T874 THERMOSTAT

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

ACTUATOR SPRING-RETURNS CLOSED WHEN FAN IS NOT RUNNING.

ENSURE THAT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR.

1S IS AN ELECTRONIC SWITCH THAT CLOSES WHEN POWERED

BY A 24 VAC INPUT.

THE COMMON FOR THE W6215A IS DIFFERENT THAN THE COMMON (WIPER) FOR THE SERIES 62 ACTUATORS. BE SURE TO CONNECT EACH TO A DIFFERENT CIRCUIT.

FDR

HVAC EQUIPMENT TERMINAL STRIP

FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD NOT BE REMOVED. DIFFERENTIAL ENTHALPY NOT RECOMMENDED FOR USE WITH SINGLE-STAGE COOLING SYSTEMS OR SINGLE-STAGE COOLING THERMOSTATS.

FOR T7300 ONLY.

FOR T7300, USE CONTACTS A1 AND A2 INSTEAD OF THE TIMER.

FOR TWO-STAGE THERMOSTATS ONLY.

Fig. 8. W6215A used in single-stage cooling system with single enthalpy changeover and Honeywell Series 62 Actuator.

9 63-2544—3

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